Passing through a door hidden behind numerous miscellaneous objects, they found themselves back at the entrance of the Master's Hat classroom.
It turned out that the path was connected all along!
If the right side of the map could be connected to the initial corridor of the Master's Hat classroom entrance like the left side, the entire map would look like a laid-down "日" character. Although the paths on both sides were twisty, they would eventually lead back to the initial corridor.
Could it be that the red heart key is actually hidden on the right side of the map?
In the end, they decided to first take a look at the Spades room, as curiosity got the better of them.
There were three Spade rooms in total. They picked one at random, but it wouldn't open. After several attempts, they realized that it needed to be opened in order from left to right.
What kind of mystery are they selling now?
"Creak..."